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240

PRACTICAL ORGANIC CII KM 1STRV

<
i, f

(6) The formation of a semicarbazone with semiearba/.ide
(see Prep. 100, p, 212).

Vx) -I-  II,N.NI1.C().N!I,        Nr:N'.NU.C()NII,  i   II,O.

Both aldehydes and kctones readily undergo <w/</<y/.v<f//v//
and a ^reat variety of syntheses have been effected in this way
(see Preps. 94, p. 204, and 103, p. 215).

The aldehydes unite with '/.inc. alkyl i \Vaxnrn and mag-
nesium iilkyl halide ((iri^nard, see p. 206; to form additive com-
pounds, which decompose with water, yielding secondary
alcohols.

,0/nCH..

en.,, co. 1 1 -i /n(cii.,),, - cn,.cnv

Vn,

XCI I:,

,  |  CII.

C 1 1. -CO. II   !   M<'('H..I .- CH,.CiK

CIL.CIK'

Acetaldchydc, in presem:e of HClj polymerises, forming
aldol. With xinc chloride the reaction jjoes a step further and
crotonaldehyde is formed,

cir-.con i- e ii;,. co 1 1 ..- cir.

...... cii;..cH:Cii.coij i n,,p.

Crotoiutltlehydt:.
PRKPAKATiON   6.

Methyl Iodide. Read notes on Prop. 2, p. 234.

PREPARATION 7.

Aniyl Nitrite.- The nitrites of the general formula
R'.O.NO are isomeric with the nilro-parafilns K'NO.,. Whereas
the nitrites are liyclrolysed with KOI I like other esters into the
alcohol and the acid,

CjIlfiONO  I   KOI I    - C.Jl.,01!   !   KNO,,
and arc decomposed by reducing agents into the alcohol and

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